I am an old TUBE guy and I am having the hardest time understanding how to work with transistors as I did tubes. No matter how many times you say it a transistor is in no way a tube. I replace a tube and I have a set of simple parameters to meet. Beam tube, pentode, triode get the voltages where they belong and its pretty much swap and go. Biasing power tubes excluded. There is some knowledge involved there. I replace a transistor its a crap shoot. every single component has to be biased in order to function properly if at all. No wonder it takes triple the components to build a solid state amp.
Transistors are a limited edition type of part. There are only so many of that part and when they are gone you are possibly screwed if you are trying to fix your amp. First you have to pray that there is a replacement part that will fit the electronic requirements. If you find it you have to pray that even though it fits and matches requirements, is it going to work. That is where I am now. I know it has something to do with the biasing of the three transistors I replaced, I am just not sure what. They were all NTE replacements but well within the range of the parts they replaced.
I replaced every diode and every electrolytic cap on the board and measured every resistor 1 meg and above. The unit lit up and when the instrument was strummed the amp played the sound to a peak and went silent for a second or two and then made sound again as it faded. I am over driving the second transistor in the out put some how , right? Sorry for the dumb questions. I have built plenty of tube amps but it is luck if I get a SS amp repaired without original parts. Thanks for your input I would love to figure out the big secret to making transistors work.
Transistors are a limited edition type of part. There are only so many of that part and when they are gone you are possibly screwed if you are trying to fix your amp. First you have to pray that there is a replacement part that will fit the electronic requirements. If you find it you have to pray that even though it fits and matches requirements, is it going to work. That is where I am now. I know it has something to do with the biasing of the three transistors I replaced, I am just not sure what. They were all NTE replacements but well within the range of the parts they replaced.
I replaced every diode and every electrolytic cap on the board and measured every resistor 1 meg and above. The unit lit up and when the instrument was strummed the amp played the sound to a peak and went silent for a second or two and then made sound again as it faded. I am over driving the second transistor in the out put some how , right? Sorry for the dumb questions. I have built plenty of tube amps but it is luck if I get a SS amp repaired without original parts. Thanks for your input I would love to figure out the big secret to making transistors work.